LeetCode 486. 预测赢家

class Solution {
public:
    bool PredictTheWinner(vector<int>& nums) {
            return total(nums,0,nums.size()-1,1)>=0;
    }
    int total(vector<int>& nums,int start,int end,int turn){
        if(start==end){
            return nums[start]*turn;
        }
        int total_start=nums[start]*turn+total(nums,start+1,end,-turn);
        int total_end=nums[end]*turn+total(nums,start,end-1,-turn);
        return max(total_start*turn,total_end*turn)*turn;
    }
};